It is pretty much standard practice that if you're driving such a rare car that you need to upgrade to one of the Pontiac Astre catalytic converters from AutoAnything. Slide up under that Canadian Vega and just start from the Astre catalytic converter and make your way back.
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With Kooks Ultra High Performance Green Catalytic Converters, you keep both Ma Nature and your lead foot happy. Available in multiple sizes, these performance catalytic converters use a Flow Thru design to clear away restrictions and crank up the ponies. 2-year EPA warranty.
Pontiac Astre catalytic converters from AutoAnything can get you a better flow and still perform their necessary functions as deemed by the government. This common sense Astre catalytic converter upgrade will leave you out with the wolves if you don't do it. Pontiac Astre catalytic converters just make sense. Don't be an outcast.